RVxxx could be bias resistors needed by the Brooktree Bt477s. U260 looks
like a linear switching power regulator (like the Power Tech on the ServerGuard).

Two S-VHS ports. ???

No idea what adf. If you have this card, or documentation on it, contact
ME!

Magni RCUFrom Dave Keiller I agree 99+% MCA adapters do require an ADF, but this
card is an exception. It only uses the computer for it's video support.
I'll send a drawing of the unit hook up. The card is used for video and
graphic mixing, cutting, and fading but software is not required
or used.